关于Promise.resolve(v)和new Promise(resolve =＞ resolve(v))是否等价问题

借鉴在《ECMAScript 6 入门》一书中描述的内容，Promise.resolve('foo')等价于new Promise(resolve => resolve('foo'))。如果resolve的参数是一个promise对象呢，是否仍然等价？

Demo1

let p1 = Promise.resolve(1);
let p2 = new Promise(resolve => resolve(1));
console.log(p1);
console.log(p2);
// Promise {<fulfilled>: 1} 
// Promise {<fulfilled>: 1}

Demo2

let p = Promise.resolve(1);
let p3 = Promise.resolve(p);
let p4 = new Promise(resolve => resolve